Dear,

Here is some details about bond

Types of bonds based on number of pairs of shared electrons.

a.   Single covalent bond – 2 atoms share exactly one pair of electrons. Examples: H2, F2, I2 and other diatomic molecules are molecules that contain single covalent bonds.

b.   Double covalent bond- consists of two pairs of shared electrons. Examples: O2, CO2 and H2CO (formaldehyde) are molecules that contain double bond.

c.   Triple covalent bonds- consist of three pairs of shared electrons. Examples: C2H2 (ethyne) and N2 are molecules that contain triple bonds.